There are two distinctly different types of basin successions; one forming linear geometries such as the Mt Lucky Conglomerate, and a second type; the Wallaby Conglomerate, that wraps around the southern margin of the Mt Margaret Dome. Mineralisation Granny Smith corridor The Granny Smith gold deposits (including the Windich, Granny and Goanna lodes) occur along a north-trending structural corridor. The eastern contact zone of a granitoid intrusion within the metasedimentary rocks is the locus of the Granny Smith corridor mineralisation. The metasedimentary rocks consist of quartz-rich greywacke, lithic wacke and minor shale, and sandstone interbeds, with a basal conglomerate of clasts of shale, quartz, quartzite, banded iron formation (BIF) and feldspar-phyric volcanic rocks. The Granny Smith granodiorite is a small (2 km × 5 km) elongate pluton which is porphyritic and has mafic-rich margins. Aplitic pegmatite dykes, which only cut the granitoid, represent the last magmatic phase. The present erosional level is close to the roof of the pluton, and in places has a thin cap of sedimentary rocks. The pluton is surrounded by a 200 m-300 m wide contact metamorphic aureole that is progressively zoned from the granitoid contact outwards through a several metres-wide hornfelsed margin, to an andalusite-bearing slate, and finally to a slate with mica spots. Intrusive breccias and miarolitic cavities suggest a high-level intrusion, where a volatile phase was exsolved from the mag ........

The Wallaby Project area is located west of Granny Smith Gold mine on the edge of Lake Carey. Open pit production commenced in 2001 and ended in 2006. The underground mining operation commenced in 2004 and is currently the only active mining at Granny Smith Gold mine.

Wallaby underground is accessed via a decline, and mining methods include room and pillar, bulk stopes and long-hole open stoping. The Zone 135 bulk stopes reflect the deepest mining in the LOM plan at Wallaby at ~1,450m below surface. Ground support, pillars and paste fill are designed to manage seismic activity. Road haulage carts ore to the processing plant from the decline portal.

Due to the variable sub-horizontal nature of the orebody, the mining methods at Wallaby underground mine involves a variation of a long-hole room and pillar methodology with no backfill in upper levels (above Z100 level) and hybrid of long-hole room and pillar with and without paste fill below Z100 level. The main mining method at Wallaby underground mine is inclined room and pillar (IRP). Other methods utilised are transverse long-hole stoping (TLHS) and sub-level long-hole stoping (SLHS).

Inclined room and pillar (IRP)
IRP is used in areas of moderate ore dip (10°-45°) and moderate ore width (4 m-6 m). Multiple ore drives are developed on a fixed gradient to traverse the ore lenses following the ore contour on that elevation. Stoping is carried out on retreat from the ore extremity bac ........

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